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Full text of "The manufacture and properties of iron and steel"

338
M'ETALIYUKGY OF IRON AND STEEL.
bon Steel Company,, Pittsburg,,-Pa., and The Pennsylvania Steel Company, Steelton, Pa., but the identity of the different works is concealed in the table underthe letters A,B, G, etc. • -There are quite important'variations in every one of. the factors. Moreover, the- divergence is not the result of averaging erratic individuals:, for whenever one7average.is higher than-another the ma-, jority of the bars are higher when taken separately^ The variations
•i . -.      : •          .-     -       TABLE XVI-V,          • '       .. .     '    •
Physical Properties, as Determined by" Different Laboratories.
NO-UK.—All bars were rolled flats, 2"x%", and -were not machined.
		Tested by                 •     •   •					
	Number of						
	heat.						
		A.	B.	C.	D.	B. '	F.
	1 --10027	58130	57880	58560	57710	67980	59280
	10028	60790	60140	61740	60080	60660	61880
Ultimate strength; pounds per square Inch.	100S01 10065 10066 10072	63560 60840 62840 61160	63330 euro 62700 .62190	64580 62180 63480 61730	68180 60440 61970 61890	68450 61290 62680 61640	64280 62200 64170 •62110
	Average,	61220 ,	. 61233	, ,62037	60795	61275	62803
	10027	42400	87850	88900	87490	S9020	89730
	10028	42200	87940	41400	88720	89780	41820
	10080	43620	40780	42540	88940	40740	42770
Elastic limit; pounds per square Inch.	10065 10068 10072	41540 42610 41400	88150 40350 87650	42250 42110 41770	88710 88905 88710	•40210 40180 40950	41250 43140 89860
	Average,	42295	88703	41495 :	'88579	40138	41345
	Elastic ratio,	60.1	63.2	68.9	63.5	65.5	66.4
	" ;   10027	29.25	29.00	80.50	80.87	'80.75	29.75
	10028	80.75	. 80.00	82.00	29.75	81.00	29.50
Elongation In ,    8 inches; percent.	10030 10065 10066 10072         .;,.	29.00 29.25 29.25 30.00	•29.00 28.75 82.25 83.75	81.00 • 30.50 80.50 84.25	28.12 80.25 29,12 .   29.87	29.00 29.50 ! 88.25 80.75	28.50 82.50 29.60 29.00
	. Average,   .	29.58	80,46	81.46	29.50 .	80,71	. 29.79
	10027	61.8	61.8	60.6	56.2	54.1	61.2
	10028	63.1	59.7	62.9	68'.9	58.8	62.3
Reduction of area;	10080 10065	60.1 61.8	57.0 58.4	60.0 60.6	55.9 56.7	62.7 55.9	57.8 61.6
,        per cent*        ,	10066	61.5	59.9	60.9	54.0	52.5	60.0
	: 10072	61.8	57.6	61.2	67.4	54.1	61.8
^." ......   :.    '•   *       •	Average,   •	61.6	59.0	61.0	:56;5	58.8	60.7
in•'contraction of area may easily be explained} for.the determination rests upon accurate measurements of an/irregular body. In a bar having an original section of '%" x f", the fractured end will have :a thickness of about 0.20 inch., and will be'of irregular form, •ihe sides being concave rather than flat. A true estimation of the